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Springtime upwelling conditions influence microbial communities and dissolved thiamin compounds in the California Current Ecosystem
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2025
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Source: Limnol. Oceanogr. 9999, 2025, 1–18
[PDF-18.05 MB]
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Journal Title:Limnology and Oceanography
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Description:Understanding dissolved concentrations of the essential coenzyme thiamin (vitamin B1) can provide insights into the biological controls on highly productive upwelling systems such as the California Current Ecosystem. To connect thiamin availability with microbial communities in the California Current Ecosystem, we measured concentrations of dissolved thiamin and its biochemically related moieties (thiamin congeners) and 16S rRNA gene-based microbial communities during the spring. We found that strong upwelling caused a depletion of dissolved thiamin precursor compounds and abiotic degradation products relative to periods of weak upwelling. Specific microbial taxa, including species of SAR11 ecotypes, Candidatus Nitrosopumilus, and SUP05 cluster, were also significantly enriched with strong upwelling. Our data provide evidence that alterations to microbial communities in the mixed layer that occur as a result of upwelling could constrain the availability of dissolved thiamin and its chemical congeners in the California Current Ecosystem.
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Source:Limnol. Oceanogr. 9999, 2025, 1–18
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Rights Information:CC BY
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